Till': ANAl'OMV Ol- MK(;AL.\TK.V(VrU.S — KESTEVKV. 433 



and is tlicn Ix'iit Itack upon itself. The rotuniing ;ii-m passes 

 throui^h the nerve riii<^, and hack ah)iig the left side of thecavit)', 

 through the pericardium to the stouiach, which is similar in form 

 and position to that of M. anuinu.-i. 



The iiUestiiie and rcctuia also confonn to the description given 

 under the last species. 



The (esophagus in passing through the nerve ring, lies above 

 the right half of the cerebral loop and the right pleural ganglion, 

 under the centre and left half of the cere))ral loop, above the left 

 pleural ganglion and the sub-intestinal ganglion, and below the 

 supra-intestinal. After passing through the nerve-ring the ceso- 

 phagus receives the duct of the tesophageal gland; this duct [du.) is 

 short and very large, and its calibre is quite half as large as that 

 part of the posterior cesophagus, into which it opens. 



The (esophageal, or Leibliiis gland, (ces. gl.) is a large 

 lamelliform organ of a dark brown colour. It consists of three 

 parts, two anterior oval portions connected together in the middle 

 line, and a posterior ribbon-like prolongation attached to the left 

 anterior piece. The duct arises from the right anterior piece, 

 which is situated on the floor of the body cavity ; the isthmus 

 joining this to the left-hand piece rises toward the dorsal aspect of 

 the cavity, and the left-hand portion lies just below the body wall 

 above the posterior oesophagus. The isthmus Avhich joins this to 

 the posterior prolongation bends downward, and the cesophagus 

 lies above it. This isthmus is not connected to the anterior end of 

 the posterior prolongation, but a little behind it, and the anterior 

 end is bent up so as to lie above the cesophagus ; the rest of this 

 ribbon-like portion lies on the floor of the cavity, just to the 

 right of the main branch of the aorta-cephalica. The walls of 

 the gland are delicate, though thick, owing to the epithelium of 

 the inner sides being raised into fine closely placed ridges. The 

 cavities of all the portions are in free communication through the 

 isthmuses. The sudden swelling at the junction of the cesophagi is 

 to be looked upon as the much reduced oesophageal ccecum (ces. cce.). 



The shape of the salivary glands was not ascertained, owing to 

 their being mixed up with the connective tissue filling the 

 anterior end of the body cavity. They are both of a yellow 

 colour, and apparently the right is somewhat the larger. Whether 

 the ducts pass through the nerve-ring was not ascertained, 

 probably they do not, judging from the position of the glands, 

 which is posterior to the ring. No trace of the ducts was found 

 elsewhere than in the proboscis ; here they lie one on each side 

 of the cesophagus ; they open as usual into the buccal cavity. 



The hepato-pancreas is of the same size (proportionately) and 

 appearance as in M. aruanus. Only one duct was found — that 

 which corresponds to the first described in that species — this is 



A A 



